Not quite sure what you mean. It is workable with just the BF862 type FET and I hope Linear Systems keeps up at least some availability of P-channel devices if you want those. The folks that insist on the rarest of the old Toshiba parts, I can't help. I am not into magical properties of a select few discrete families. I've used ordinary parts right from Digi-Key for the most part. Not sure if the J310 family is still made by somebody.
I plan to present something at Burning Amp.
In current production as a preferred device J309 & J310 from On Semiconductor.
Mouser stocks them in depth.
Hi Scott---- I've looked from time to time and maybe missed it.... do you have FFT's for your design... where?
Thx-RM
Thanks, they make a good high Vgs cacode for BF862's that does not need another reference rail (just the gate (J310) tied back to the source (BF862)) and of course they are VERY cheap.
Somewhere, in any case I will be building a clean prototype (the patches got a bit messy) and repeating everything. I remain pretty convinced a 20dB line stage can drive 600 Ohms at < 10ppm at 20V p-p and 20kHz with the single gain stage. The first prototype looked to be 3ppm or so but my setup at the time was not great.
Jason will be welcome to put any presentation into the permanent archive.
Off topic here but briefly tossed around in this thread, and of possible interest, the subject of the effect of I-V converter input impedance on current-output DAC performance, based on some calculations and simulations: http://www.diyaudio.com/forums/digi...-makes-r-2r-dac-nonmonotonic.html#post3565135
I decided it was best to start a new thread.
Brad
I decided it was best to start a new thread.
Brad
He is visiting other sites where folks don't abuse him. After a break he will come back to this brawl.
- Status
- Not open for further replies.